posted on michaelbay.com
Nemesis Prime comic con 2008
if your asking who Nemesis Prime is, its an evil version of Optimus Prime.
Nemesis Prime was a Cybertronian leader (most likely an alternate form of Optimus Prime) from another dimension conquered by Unicron. In that reality Prime was defeated by the Herald of Unicron known as Megazarak. Captured, it had its spark tortured and experimented on by the Chaos Bringer. Unicron kept the Prime locked in a state of unbeing, its spark separated from body, yet prevented from joining the All-Spark. He was tortured for an eternity until pain became indistinguishable from pleasure and the former Autobot longed for only this sensation. Broken, he was reformatted into Nemesis Prime and granted Unicron's Dead Matrix, the former Primes' Matrix which during the centuries of torture had rotted and been perverted into a weapon capable of annihilating Primus, just as the Autobot Matrix possesses the power to destroy Unicron.
It is the commander and most evil member of the Decepticons gathered by Unicron. It also serves as one of the greatest threats to the universe next to Unicron, possessing the wisdom of an Autobot leader yet devoid of all compassion. Of note is that Nemesis Prime is listed in Biography material as a "Champion" of Unicron rather than a Herald. This is believed to denote that the character voluntarily carries out its role rather than having to be constantly coerced or forced into action as Galvatron often was. Additionally, it could be indicative that Nemesis Prime is the most powerful of Unicron's servants.
yes I am a nerd.